When building a search application, stemming is often a must as it is desirable
for a query on skiing to match documents that contain ski or skis. But
what if a user wants to search for skiing specifically? The typical way to do
this would be to use a multi-field in order to have the same
content indexed in two different ways:

This is not something that is easy to expose to end users, as we would need to
have a way to figure out whether they are looking for an exact match or not and
redirect to the appropriate field accordingly. Also what to do if only parts of
the query need to be matched exactly while other parts should still take
stemming into account?

Fortunately, the query_string and simple_query_string queries have a feature
that solve this exact problem: quote_field_suffix. This tell Elasticsearch
that the words that appear in between quotes are to be redirected to a different
field, see below:

In the above case, since ski was in-between quotes, it was searched on the
body.exact field due to the quote_field_suffix parameter, so only document
1 matched. This allows users to mix exact search with stemmed search as they
like.